Relationship of number of cigarettes smoked to "tar" rating.
D005163:Factor Analysis, Statistical; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D012494:Sampling Studies; D012737:Sex Factors; D012907:Smoking; D013638:Tars / Q000032:analysis*; D014481:United States
D013638:Tars